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Old 16-08-2011   #1
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Sticking Throttle

Ok, i need some help on this as im getting sick of Fiat dealers, its going in for the 5th time on monday.

Heres the problem. (its a Punto Evo GP 1.4 8v)
Generally throttle response seems, lazy? I can blip the throttle quick and nothing will acctually happen but, at the moment i am working away from home and if i have a really good run home, once i come off the motorway the throttle will, what seems to, stick a little. When changing up through the box, the revs will continue to rise for maybe 2 seconds then hold for about a second then drop very slowly. The strange thing is, by the time i get back home, approx 10 miles from the motorway (approx 40% dual track, 60% town) the problem seems to go and return to 'normal' for this punto.

So far Fiat have done the following things;
  1. (Dealership bought from) Test drive - 'no fault found'
  2. (Dealership Bought from) after being dropped off by the AA - Diagnostics, Test drive in various manners - 'no fault found'
  3. (Dealership boought from) Same as above
  4. (Dealership near work) Test drives and Diagnostics - No fault found - Re-learned the throttle posistions
  5. (Dealership near work) test drives and diagnostics again - No fault found - Fitted brand new throttle body
I have shown the dealers a vid of what happens on my phone but it would seem that they just cant find a fault, but its there!!!

Anyone else had this issue?? Has it been resolved?? At the end of my tether with this as its scaring the poo out off me at times as its just not slowing down!!!!!
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Old 16-08-2011   #2
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Re: Sticking Throttle

It's simple- if they can't replicate how you are driving the car and getting the fault, then arrange to take the DET out with Examiner recording the ECU parameters and demo the problem yourself. Sometimes it's the only (and quickest) way.

Although what you are describing sounds fairly normal for a motorised throttle to me. Tried a test drive with another similarily-specced Evo?
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Old 17-08-2011   #3
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Re: Sticking Throttle

I will suggest this to the dealership, see what they say.

I do hope its not normal, when at its worse, its dangerous! I havent drove a similar spec evo, no
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Old 17-08-2011   #4
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Re: Sticking Throttle

sounds normal, as it doesnt have a throttle cable there is a delay as its fly by wire, due to the fact its a 10k punto and not a 200k ferrari the delay is longer than expensive cars. unless the vehicle actually surges or accelerates on its own then i cant see any problem with it. mine does the same when you blip it really quick, but havent really noticed the motorway part as i dont really use motorways.

so unless its doing it all the time and you have drasticly low MPG i cant see any fault imo.
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Old 18-08-2011   #5
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Re: Sticking Throttle

to be fair i accept that it wouldn't be super reactive but the fault occurring after motorway use really isn't acceptable. When changing up a gear, the revs will continue to rise for far too long and when letting off the throttle to use engine braking, it is like i have cruise control on!
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Old 18-08-2011   #6
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Re: Sticking Throttle

then you definitly need to take the car out with a technician and proove it.

or lodge a call with fiat whom will investigate.
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Old 18-08-2011   #7
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Re: Sticking Throttle

At least if you demo the fault with a Tech beside you, they'll be able to see what happens and how to replicate it. Then they can spend all day testing and even taking a car or two off the forecourt to do a comparison.

It may take time for a thorough diagnosis, and to find a cure, though. How long are you leaving it with them? Sometimes a tricky problem can mean having to get a Fiat Engineer out to help and may involve them having to relay data back and forth with headquarters.
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Old 19-08-2011   #8
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Re: Sticking Throttle

the dealerships have been keeping for just about a day at a time and giving it back to me. I have suggested that they need to Drive the 80 odd miles home i do when the fault occurs but they shrugged that off as something they 'couldn't' do!

Fiat are aware of an issue as the AA were called out to it (under instruction from a dealership).

We shall see on Monday, its booked in there for a couple of days so fingers crossed
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Old 19-08-2011   #9
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Re: Sticking Throttle

I noticed mine does this sometimes, thought it was my driving but obv not. I dont think its a problem but let us know what the outcome is come Monday
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Old 23-08-2011   #10
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Re: Sticking Throttle

UPDATE;

So Fiat have had the car for about a day and a half. Apparently the service manager took it home last nite, couldnt get it to fault. There was a software update for the stop start that they have done, they are hoping (dont know why) that this will fix it, even though its not related!!

So, after it faults on me again on the way home whenever this week they are going to have the car for a WHOLE WEEK!!!!! and try and get to the bottom of it.
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Old 26-08-2011   #11
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Re: Sticking Throttle

update; Still faulting, now booked in at Fiat for a whole week!
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Old 26-08-2011   #12
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Re: Sticking Throttle

Quote Originally Posted by Turbotez View Post
update; Still faulting, now booked in at Fiat for a whole week!
Demo the fault to them. Arrange the time and drive the DET all the way to your house and get him to drive back to see HOW to get the fault. That's the only way they will know the exact conditions it occurs under. I've driven 50 miles at a time to recreate an intermittant fault, it's just making sure the time is available in the workshop loading.

And, if possible, get them to arrange a courtesy car with the same engine as yours (1.4 8v will be likely courtesy car material) so YOU can see if it's normal.
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Old 27-08-2011   #13
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Re: Sticking Throttle

they have it for the week to make sure they can properly find the fault. They gave me a 1.4 8v last time it was in and that car felt a lot more responsive, which i told them, but i dunno if they were listening!
When u say DET i assume u are referring to the diagnostics. The problem with that is a) Its time out of my working day that Fiat wont refund to my boss. b) they wont send it out with me as its the only one they have and it costs an alleged 5k!
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Old 27-08-2011   #14
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Old 27-08-2011   #15
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Re: Sticking Throttle

Quote Originally Posted by Turbotez View Post
When u say DET i assume u are referring to the diagnostics. The problem with that is a) Its time out of my working day that Fiat wont refund to my boss. b) they wont send it out with me as its the only one they have and it costs an alleged 5k!
Quote Originally Posted by D4nny8oy View Post
Arrange the time and drive the DET all the way to your house and get him to drive back to see HOW to get the fault.
It's the DET's job to take on issues like this. If you want a definitive answer, either book half a day off work, or arrange the drop-off and test drive on a day you're not working.

And no, the Dealership will never let anyone drive off with 's of Examiner diagnostic computer.
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